Suspension and levitation in nonlinear theories

Details Suspension and levitation in nonlinear theories Suspension and levitation in nonlinear theories

1998-03-05

arxiv.org/abs/cond-mat/9803060v1

Physics

Condensed Matter

Five pages, Revtex, to appear in Physics Letters A

Scientific paper

10.1016/S0375-9601(98)00166-2

I investigate stable equilibria of bodies in potential fields satisfying a generalized Poisson equation: divergence[m(grad phi) grad phi]= source density. This describes diverse systems such as nonlinear dielectrics, certain flow problems, magnets, and superconductors in nonlinear magnetic media; equilibria of forced soap films; and equilibria in certain nonlinear field theories such as Born-Infeld electromagnetism. Earnshaw's theorem, totally barring stable equilibria in the linear case, breaks down. While it is still impossible to suspend a test, point charge or dipole, one can suspend point bodies of finite charge, or extended test-charge bodies. I examine circumstances under which this can be done, using limits and special cases. I also consider the analogue of magnetic trapping of neutral (dipolar) particles.

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